Quality assessment of 11 KV transformer by internal dissolved gas analysis using CFD

Abstract: Transformer oil is usually a highly refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. When high voltages are applied to this insulating material it deteriorates and also with life span .This generates hydrocarbons in the mineral oil. The collection and analysis of gases in an oil insulated transformer was discussed as early as 1928.Many years of empirical and theoretical study have gone into the analysis of transformer fault gases.DGA usually consists of sampling the oil and sending the sample to a laboratory for analysis. On line monitoring of electrical equipment is an integral part of the smart grid. Large power transformers are filled with oil that cools and insulates the transformer winding. Mineral oil is the most common type in outdoor transformers. Fire resistant fluids also used include polychlorinated biphenyls (PCB) and silicone.